The CAS Registry Mumber 2212-51-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,2,1 and 2 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 2212-51: (6*2)+(5*2)+(4*1)+(3*2)+(2*5)+(1*1)=43 43 % 10 = 3 So 2212-51-3 is a valid CAS Registry Number.
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